An investigation has been launched into an in-custody death that happened while a man was being detained following an altercation at a downtown San Diego bar Saturday night.

A San Diego police officer responded to the Star Bar at 423 E St. at 8:15 p.m. Saturday on a report of a violent man outside, the San Diego County Sheriff’s office — which is leading the investigation into the death — said in a statement.

Officers responding to reports of an altercation and gunfire at a residence in the 1600 block of Chalcedony Street about 10:15 p.m. Sunday found 31-year-old Richard Herrman outside the condo with a gun, according to the San Diego Police Department.

Investigators allege the man was involved in disturbance and struggled with security staff and police officers Saturday night at Star Bar on E Street

Sheriff's deputies say the man became unresponsive after being restrained by a security guard and police officers.